Whose head is the best? Header information about PHP

Header information is important, 2 people, one called server (service side), one called browser (client), that is, there are 2 header information, request header information and return header information.

Then if the header information is obtained through PHP, the server wants to get the header information of the browser request, can use $_server, the code is as follows:

 
  $value) {$headers [$name] = $value;      }      return $headers;  } Var_dump (Getheaderinfo ());? >

Output:

Array (size=32) ' http_host ' + string ' localhost ' (length=9) ' http_user_agent ' + = String ' mozilla/5.0 (Windows NT 5.1; rv:20.0) gecko/20100101 firefox/20.0 ' (length=65) ' http_accept ' = = String ' Text/html,application/xhtml+xml, application/xml;q=0.9,*/*;q=0.8 ' (length=63) ' http_accept_language ' = = String ' zh-cn,zh;q=0.8,en-us;q=0.5,en;q= 0.3 ' (length=35) ' http_accept_encoding ' + string ' gzip, deflate ' (length=13) ' http_cookie ' = = String ' Bdshare_fir stime=1365907820098 ' (length=30) ' http_connection ' + string ' keep-alive ' (length=10) ' http_cache_control ' = = str ing ' max-age=0 ' (length=9) ' PATH ' = = String ' C:\WINDOWS\system32; C:\WINDOWS; c:\windows\system32\wbem;d:\svn\bin;d:\curl\curl-7.19.5; E:\mysql5.5\mysql\bin; C:\Program files\mysql\mysql Server 5.5\bin; C:\Ruby193\bin; C:\Program Files\sinovoice\jtts 5.0 desktop\bin;d:\php\xampp\php; C:\wamp\bin\php\php5.4.3\php.exe; '  (length=266) ' SystemRoot ' = "string ' C:\WINDOWS ' (length=10) ' COMSPEC '" = StrinG ' C:\WINDOWS\system32\cmd.exe ' (length=27) ' pathext ' = = String '. COM;. EXE;. BAT;. CMD;. VBS;. VBE;. JS;. JSE;. WSF;. WSH ' (length=48) ' windir ' + String ' C:\WINDOWS ' (length=10) ' server_signature ' = ' = String ' (length=0) ' server_s Oftware ' = = String ' apache/2.2.22 (Win32) php/5.4.3 ' (length=31) ' server_name ' = = String ' localhost ' (length=9) ' S Erver_addr ' = ' = String ' 127.0.0.1 ' (length=9) ' server_port ' = ' + String ' (length=2) ' remote_addr ' = = String ' 1 27.0.0.1 ' (length=9) ' document_root ' + string ' c:/wamp/www/' (length=12) ' server_admin ' = = String ' Admin@localhos T ' (length=15) ' script_filename ' = = String ' c:/wamp/www/1.php ' (length=17) ' remote_port ' = = String ' 2483 ' (length= 4) ' gateway_interface ' = = String ' cgi/1.1 ' (length=7) ' server_protocol ' = = String ' http/1.1 ' (length=8) ' Request_ METHOD ' = ' + string ' GET ' (length=3) ' query_string ' = ' + String ' (length=0) ' request_uri ' = = String '/1.php ' (len gth=6) ' script_name ' = StriNg '/1.php ' (length=6) ' php_self ' = = String '/1.php ' (length=6) ' request_time_float ' = FLOAT 1366034246.187 ' REQ Uest_time ' = = int 1366034246

You can see not only some information about the output client, but also some information on the server. For this information specific role, here is not more, please see http://www.cnblogs.com/IAmBetter/archive/2013/04/11/3014796.html

In fact, for the Apache server can use out-of-the-box functions: Getallheaders (), with the benefits of this function is not much to say, directly look at the return value

Array (size=8)  ' Host ' = = String ' localhost ' (length=9)  ' user-agent ' + = String ' mozilla/5.0 (Windows NT 5.1; rv:20.0) gecko/20100101 firefox/20.0 ' (length=65)  ' Accept ' = = String ' Text/html,application/xhtml+xml, application/xml;q=0.9,*/*;q=0.8 ' (length=63)  ' accept-language ' = = String ' zh-cn,zh;q=0.8,en-us;q=0.5,en;q= 0.3 ' (length=35)  ' accept-encoding ' + string ' gzip, deflate ' (length=13)  ' Cookie ' = ' = String ' bdshare_ firstime=1365907820098 ' (length=30)  ' Connection ' = String ' keep-alive ' (length=10)  ' cache-control ' = String ' max-age=0 ' (length=9)

There is no such parameter as HTTP_, and there is a need to deal with such problems.

Knowing how to get the header information from the request, you should also know how to set the header information, such as:

The client gets the header information for the server setting [name]

So what's the use of this? Actually have to judge what the other party is the request? Is it a synchronous request or an asynchronous request?

2.html page is the request page

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Results:

Finished, said not good everyone forgive.

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